Railing Post Spacing

I used the post sleeves that are engineered to slide down over 4x4 posts. The pre-cut railings are made for 8-foot-on-center and 6-foot-on-center spacing.

For this reason I laid out most of my deck posts for the 8-foot spacing. If I could do this over, I would have put them at 95 and 1/2-inch or even 95-inch spacing.

On the negative side you'll have difficulty getting perfect fits of the railing sections if your posts are even slightly out of plumb. A point often overlooked is if the 4x4s have the slightest amount of twist. The 96-inch center-to-center post spacing will have you cursing for sure.

Another key point is be sure the 4x4 posts you use are carefully selected. To avoid warping and twisting, only use posts that have been cut from the center of the tree. You want to see the sapling core in the center of the post for ultimate long-term stability.

Rail Post Height & Low-Voltage Cable

I installed my rough 4x4 posts so they were 40 inches above the treated floor joists. This created a 1-inch dead space on top of the post after the sleeve was installed.

You can see the dead space on top of the 4x4 post. You'll be glad it's there if you're putting in post caps that have the soft low-voltage lights. Copyright 2017 Tim Carter

As a result this dead space was perfect to house the extra low-voltage wire tail that comes with the lighted post caps.

The post sleeves have friction ribs on the inside so they fit snug on a 4x4. I wish I would have taken the time to create a 1/4 x 1/4-inch routed recess groove on the post for the low-voltage cable to fit inside.

Instead I just put the cable near one of the corners to completely avoid the friction ribs.

Cutting Railings - Go Sloooooooow

The railings seem to be made from fiberglass. This gives them great strength. The Vintage Lantern brown color is some sort of coating on top of the fiberglass.

The red arrows point to small chips in the dark brown coating on the railings. Cut slowly to avoid this. Copyright 2017 Tim Carter

I noticed chips on some of the cut edges. These happened because I cut too fast.

Code Compliant Stair Railings

The building code is a dynamic document. It changes every three years.

You need to be very precise with your post placement on stairs for the railing height to meet the code minimum.

This placement, in my opinion, conflicts with the BEST place to put the posts for maximum strength and stability.

I put my stair railing posts on the inside corner of the rough stair stringer and riser. Recessed through bolts through the stringer lock the post in place.

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7 Responses to Trex Transcend Railing Installation

Another terrific article with pointers not found elsewhere. Two questions: Since the posts are covered with sleeves, would laminating two 2x4s serve the same purpose as a 4x4 while eliminating the risk of a twist or bend? Second, do you use the "backward" saw blade method for cutting the hollow Trex? If so, which blade do you use? Sorry, that's three questions. Thank you.

Two 2x4s would not work unless you sandwiched in a spacer. The sleeve would rattle without it. They're made to friction-fit a 4x4. You'll have no issues if you just get 4x4s cut from the center of the tree.

I didn't use the "backwards-blade" method. I simply cut too fast on the one angled cut. After that, I just dropped the miter saw blade into the railing material slooooooooowly.